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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9676e9e90359d218cdb8aa3c9b8ff07a2c326fe2a37cfbf88a2e4ccefda390ec' 
  AND token = 'knv89mjUZU2H6FiBiWPrO16CcPEvRmhsiAnijDnz+gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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