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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4a8ac8d13f186f6d4bd964054f4cd725a2bda728a846dba68efa3b2dec1c48' 
  AND token = 'fcirVo2YGtxSNRceHkGvvL2g7ollsXhA6iicUHeIEEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}