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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f14c4d73a9a83cb09d759acecc6ccb801680ab544004be277124c726702e39' 
  AND token = 'UABmgypc02GpyrRs7KH3tC3Y7s3TTdRUI2weUrVqCNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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