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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815d2bdde1cbbbee0cfcf1b6b71edb6fc069fce716d6f644cc17b0d5a02c8fca' 
  AND token = 'j2zlMFvLy26CGER2yni9gNevamzR5/n2a3xxHx02UQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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