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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5bbc6e5f374595362f6b75f6d2291b6bf70b813549d50cd7c5ebdf7b3b260d' 
  AND token = 'zRzf/iywwjN1pprE0kBNmvj2G6Mswz3cPKTPC3yPK6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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