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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b563e89a40bc7f25fef42d3b7302abc08d5163968455404a2a75267ca7ef53' 
  AND token = 'iUgr4OksA2kdeK/KHIKGMC9PipuYlSC/HL8omgVTgO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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