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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8393d17c4fae2e0dda13599694a55b354c71d8006acd765ba64d81398710546f' 
  AND token = 'vpoPGvbtOFdoW3j84l9wGtRUDsXdurs+IIJ9Tn/xtYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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