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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0c7ac9b1ab0ab929b769a39e87849b512e3bf7486a42f1ce0bcc34ab98c98c' 
  AND token = 'T/fexN884OqKZIz6JdNq7/nxw94+V1Y/h9uLFZ0LN4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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