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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec35247152bf3b5edd1bdf207d8e0df7e01defe7ef998f443ec1f116bf8726ce' 
  AND token = 'HlEMIgzClQTRx2nxu9l7LT5n6dn63PZ+rWaXWtFn1Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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