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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c11e3913e30481bf0a5d4ec4816f50a71b20a943ae98ae45d64df0721a316bb' 
  AND token = 'Cez3XKCybUvRu2+bLiTIn/reH/b/pzdmms4AA+F+d5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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