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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef37d8a939be871886623aa877743b71fc54b9c2c0b5745b3c63094ec47653ca' 
  AND token = 'rKbqvodSFXtsF70R6Ex6kCvccAnOV+k0/v1OHMJdWWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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