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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd402ef4b91842af425e54aeec89ce05efa1694df39b253d6dcce3e56d473d881' 
  AND token = 'J9j8S9qT8ElzIO+HjZWR2YMNe1du9ZaMLHj09r7ctlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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