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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9524baf15a750a1e023c276941fd0e013a35406e84b21d26b3f05d5386d36b61' 
  AND token = 'qCzFnC48GgD6JjhMFRd3/IPtE1jM2y/2YGhYKeYGc4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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