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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66c9e79009b5497906b898cf54d50c4943910d135a03e707d4e403fa537ea9b' 
  AND token = '9+9JC9AMF/h/azO9UuSVlPlJ1ZDfpjAop8NhXdoSFxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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