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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d74915d1401de851b89b3d5aaabd95517752a6238c8734bf32c9f6433548577' 
  AND token = 'WueaU7n14EHFW5AqH4lD4N84yvl2D7/N6La1TP/5UQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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