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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1bf51cad426a5bbfd5a4d86a12ad4028c3cff08575ee53623fe0d1c0da3732f' 
  AND token = '8Xt2TNorWivg5kmy/BTjcejBpEhqnxB7in5s4+o59sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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