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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfec7807bca2880ea8e89e98bd93c4ac9e8c3c262fb22483709a075a9fce674a' 
  AND token = 'srQjgNIiGy0kc+Rah6+/iT4x9yBjQHtOnd8sacuxeTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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