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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9867788ce2a90ffed4f10322f5e4fe529f3a5e4e4d2ccba5192f3dc98f29f00b' 
  AND token = 'XPXjrCCzGhqC3uHJC4dDA/UG7oNPWvQ2p7DhsTttcU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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