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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1af516ce3df82503add2ee8067864f170fd9c14ebf2a026774c4ab777f112c' 
  AND token = 'Uvw1c6AdOm0OK9V44gnkE+qPcgVoas9ON45jUMr6UnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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