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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3d8d695e3d3eca010fa5f1540473a575119a2de04805a582cab4f61e9fd600' 
  AND token = 'CKEgEJeY9ZkU3pCS6grI+ggK3WWP1NXgUvY7IAD83C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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