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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839617705325b6676c411e8616de8a0c3ece9afbd7592b4df9452e4b6dc519b1' 
  AND token = '1akvuhT5Jz39Qaz8G3BpggAcjjBp8bLaRxny5oEeLIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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