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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079cab819a5eaaf674e17f359fd9b6b64b8146820a0af06a6a79f6bbb599f7c2' 
  AND token = 'CXO04WoopFns6vHw5jY5Tq728dHrdJSPis4/imsWV9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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