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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbeb20daad6906f78b834772e592c3eb40761d96de7e48654a17e6b7db9d198' 
  AND token = 'QKbsaZPIQvrOmsiahz43vzO9IXq8zibA8s/OLWgbKds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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