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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7141d3f5e5332e00533d7a4512c575ceb7cbb6cff341e30897bc2c405dd45c2' 
  AND token = '8MnDkFgeLm5E2rygTXIFo/XjvwBBoqYcglsxj8Oo4lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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