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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b69d22ab2bd1ac75ccbc3038b8e2e86282d143c7fe2be3d77cd8c3053618f2' 
  AND token = 'aE3Y6XNl7mbJuUgS2M+sjwVv2nLuInrH37IddaHhz4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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