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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6300d0c0a7326c8e9ba6e9f30fc20bc4a65400fff16ba53452136dcbf15969' 
  AND token = 'ZrvwiKCBpbplN3NL4QjYWXuyOWoqxXgrzo2On2tyrLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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