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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88f5629bcb84f8b64ecd3adab31fefd8ec58d77ea187cfce45c708cc5b7b15f' 
  AND token = '0kUrw1j1AecLZMUr8qb2ZFahJHt+vEoycOzXRykRDHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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