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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e2028718e319fea8b411ba1c90113711a761406490bcb2cb58c44e2720e8c3' 
  AND token = 'VYymoAjBnHv3QYz8So5knloP/KE2H8Cyn+us3sx6UkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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