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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976e5d57b8ccbbaefc28cc2632557fd6ccbf29a7f1ac6e428b82111d0b415a97' 
  AND token = 'ImOL7FEPj4jdJFLu/gwI6Tjn6RpOwuhm9yJhWOjoz8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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