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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735f54a12c38dea9611e9d8956b7f58be537e4c75fa7576488163e0e32f14356' 
  AND token = '0Iv1Pv/6RPb7QwjWHvIJsaDIXkXHQbJ2+saE1Wfd2YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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