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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babb05b77a44f5b8884a869dab2a4a62fc5859f18eedfdbeb5e06031709ac6ff' 
  AND token = 'BlK2fD935EbMqtON+XssCIW2BUVtXwxdQ4WRJQ5U0tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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