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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0e9e9c8683f1a19806037cf8b3005c9e7e5010f28fba731285058667358569' 
  AND token = 'XbtdSKn8+r5MQrFRq77R9/dm/BMRo3DdXP/NneaklD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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