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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a451eaca2f99dd6ca866db1884d472fba060fa248968c63b2d6243725bd902c7' 
  AND token = 'cdYW1Q2bx1zJJngUhUNSx29Dq/U2Grcar+6OAP7uVXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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