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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592685871e9c52394c865d8a9c93e9b0f264f7d79e864e1dd3c4bf3885c622e2' 
  AND token = 'jjr9Wc2GWnfqLkNYiOBEus3q5cnlMKIFGexKGGYzHOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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