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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f892ea89acb7a696bdbe39b935e4d8e8ce13787953e2d11473a1f20b1dafe8d' 
  AND token = '3vzXyGNq0LIBfn/Zob2zA8Ljl+Y9sCcnr7q+MQ1zsS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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