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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96405c6829070eb215f922790f963789b8b7a97f3c975a21de93b2d521d4590e' 
  AND token = 'rnUjiT/CxXsAZGvDi7v5NxMFk2LdsoGVdyCUe6Q+R3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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