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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e311a4cb2103cd8351ed63dcf8f3c7af9ced19ef518a9b3c912aea124aefe734' 
  AND token = 'lYAB4BQ8STX0m3hWKqy5MBT1RoKdGAA/Am0YmovGsf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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