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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b5e942230a41f1085f7e1a2b18af0fa3fc5212d6f69f158f3bb31e22c6cf25' 
  AND token = 'CbRVrPHu2s3wC6ux0MLf0JNI9cf12gzKACQQOy/Wtz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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