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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaff624acbe2928960fa78d80609c68c070ad041957f16e8723ffc60932f85f7' 
  AND token = 'QJAgORLja9vBDDHakF5KcVUcQcR7qSozFeOsA+WFqWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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