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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9055428c9654b7e33cffe722648147adb268ad16d846fbf8996b94f5a9ec999a' 
  AND token = 'NnDLkeYnoPf9t+2ulLh8/TUvPUTrT7n/3FegeTs+jio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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