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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdaa70e875dadab5cd50d2ab00bd7a82d8888d0b45e5861acc4b3f138d04a41a' 
  AND token = 'pxva2Tdn4Z7OXBiNpsvwyAIkWtXn6bZbjvYDplJkjcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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