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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20a0c4a529af54ed45d81ab83eb7ee35863f795b27a54865e82544c674b27c3' 
  AND token = 'yiM5yjZ/06YSvKwWx0awUyLtfbTq9QUwIJLWUovOOjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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