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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2039831252b73ddba3d1c1f62227d99814995294790ce30a6dca705bd679a442' 
  AND token = 'j4qRh28bYINhvOTNbfDGch8srgK8ds7+d9K3W5sXRyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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