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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d9f205037dca77b4058efe8cc109b0dd5186b28d1bda53eb8ffd21b588ca9a' 
  AND token = '0jqhRQAq4gQzVMo++1qyqJ+QWQ52uQTHwG+b6lVU3LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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