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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4cb0347dd24d072e3b294bd847355c1ac9d3584ab2acfb7e8a6d498d144bcc' 
  AND token = '2HEC/m+U3lgOa7UJHkCNbVH9DMe/q7Pd2y6XBwG8ovQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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