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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7cf7aac62bf5d2b62fdb8378c99c3bb9aeeeea33ca75e45c795b8c671d3c0d' 
  AND token = 'Cjn0WT4hrmrM41OV4KvKi+iSXJ6QCWsYOobiHM3o/jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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