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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89c39b0de132ec8bd1033273edd862518ac752ec2df750f68b9003c5e5ad6b3' 
  AND token = 'TYsviGn2j3IggUDQm8H3+fRPkyesKTcsOouw6JnP01M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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