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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '163029b873ff9f8b428006748c6270511813d7ecb8e4273ff6eb904f5e33acb0' 
  AND token = 'LOcuzw25WDygMD6c5W7lpg/GflMn0A9nsBtJZ7s8gK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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