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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad849b9860e122310fc52984f3d414334378ccf5afeca9fd4303d42d799d63a' 
  AND token = 'IwAurhl48llETgk4MA7R78avvAHHhisBXLG8gptIL3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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