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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156e668022049af24c03c55e325c4e7a00a392aa16cccba24ce68979fd6ea7ff' 
  AND token = 'q6K3/kwI36ROIo3D2b6sGA7f6IWhHi6flx0BOto64ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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