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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f5f1d2612744a94302545d01f042faf4942d906d2d59bb2b106f27c5256f1d' 
  AND token = 'ShTK6edGXuV+OmTvLWrIwgTvIe7VX502eDqAEUgApRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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