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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb66ad79ba169193904862e99061fcb140900a30013272616bdab3c1ad723f8' 
  AND token = '/F1vWznjUJPVur8XC9gC53aCpxl9MuxqV4/0gxr6R/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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