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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3474890a0e63aa92f3ed5889a46be2f36217599906cc7b34ae417a4aa9300da9' 
  AND token = 'wHZrKcZ6qViYGqDpcR+9m8fLBG2p1GAkkI7FniCru3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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