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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5cc20373589d55ec3e8da9d603831d5a05ed824bfd2e55e1bc5797fd3f1c7e' 
  AND token = 'UznEF9RcWYWIToiRFh0cAuWkzQ3e34l1YsGhY757Z5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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