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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df1b0cf56870b9fa205e7eee92df1c769adba92bd5104adca2d2dc011f8e37d' 
  AND token = 'XGSjGe6jZfaXYudnm6nQoeLXD4Czqi69fb9idCZCN/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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