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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f49f3a952bbba5ed50d725d4b2f92fc0ff028a32663680d3ad4a03cb96cb213b' 
  AND token = 'mgsluVeCeBOIAIV5fRu67wFXzCSYOv9CpCfFX8lF6g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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