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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b40f519fbf908d81f16b2b8edffb9962c487a9402c13a27b14977004a08752' 
  AND token = 'p+3iyZF/oTPO4bqG88clDdHMd86jkCZchkXxnNywFoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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