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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b2c5717fe05b4d4a113d6f7f886f86d14a8aad2694c897fa1a2bd33a34a468' 
  AND token = 'JaKV2LljFP1lBeGcTNO6jwmHLGNADI62dTPVSv6BbQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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